Re: USB 2.0 problems digging me in deeper

From: Haggis (bingsnapREMOVE_at_hotmail.com)
Date: 02/11/04 

Date: Wed, 11 Feb 2004 13:51:21 -0400

good info from Stan...

BTW this is NOT a "support" site ...it is a discussion group of users (some
more knowledgeable than others :> )

hope Stan's info was a help

"Stan Mitchell" <stanm@sourcequest.com> wrote in message
news:OI4ZkRM8DHA.2576@TK2MSFTNGP11.phx.gbl...
> Hi Brad,
>
> I'm not affiliated with Microsoft but maybe I can help you.
>
> First, it sounds like your drivers are installed correctly,
> since you see an EHCI entry in device manager.
>
> Each USB host controller has one root hub and multiple ports.
>
> From your description, your motherboard has 4 host controllers:
> 1 is EHCI (high speed) and 3 are UHCI(full/low speed).
>
> Each host controller has a root hub and the EHCI has a
> "USB 2.0 Root Hub" while the UHCI controllers each have
> just a "Root Hub".
>
> The EHCI controller has 6 ports while each of the UHCI
> controllers has 2 ports.
>
> To the outside world the EHCI and 3 UHCI controllers are
> a single package with 6 ports. If you plug in a high speed
> device into any of these ports the EHCI controller will handle
> the device. If you plug in a low or full speed device a UHCI
> controller will handle the device. Because of this automatic
> switching behavior, you can use each of the 6 ports for any
> speed device.
>
> Hope that helps,
> -Stan Mtichell
>
>
> "Brad" <anonymous@discussions.microsoft.com> wrote in message
> news:33A47117-79B0-48A2-8502-512A7A21DCAF@microsoft.com...
> > Well I seem to be talking just to myself, but then computer support has
> always been an illusion anyway!
> >
> > I now have one port that works in hi speed mode. The others just
function
> at 1.1 speed. The motherboard manual clearly states that all 6 are 2.0.
> The chip set is the Intel 82801 DB ICH4.
> >
> > In device manager, you see "Intel(r) 82801DB/DBM USB 2.0 Enhanced Host
> Controller - 24CD" for the first entry.
> > Then 3 lines of "Intel(r) 82801DB/DBM USB Universal Host Controller -
> 24C2" (at ends: 24C2, 24C4, 24C7)
> > Then next line "USB 2.0 Root Hub".
> > Then 3 lines of "USB Root Hub".
> >
> > I have spent hours reading other USB problem entries. None seem to
> provide anything conclusive. Do I have the right drivers installed? ASUS
> says that the XP drivers should be used. And one port does work. So what
> the heck is going on???
>
>

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